Edgar McLean Stevenson, Jr. (November 14, 1927 – February 15, 1996), better known as McLean Stevenson, was an American actor most recognized for his role as Lt. Colonel Henry Blake on the TV series M*A*S*H.
Stevenson was born in the town of Normal, Illinois, in McLean County. He was the great-grandson of William Stevenson, brother of Vice President Adlai E. Stevenson, making him a second cousin once removed of presidential candidate Adlai E. Stevenson II. He was also the brother of actress Ann Whitney. His father, Edgar, was a cardiologist.
Stevenson was educated at Lake Forest Academy and thereafter joined the Navy. After his service, he attended Northwestern University, where he graduated with a bachelor's degree in theater arts and was a proud and well-liked Phi Gamma Delta (Fiji) fraternity brother. Afterwards he worked at a radio station, played a clown on a live TV show in Dallas, became an assistant director at Northwestern and sold medical supplies and insurance. He also worked as a press secretary for his cousin in the presidential elections of 1952 and 1956. He formed the "Young Democrats for Stevenson".